Time-Course Analysis of Levels of Indole-3-Acetic Acid and Expression of Auxin-Responsive <Emphasis Type="Italic">GH3</Emphasis> Genes in <Emphasis Type="Italic">Betula platyphylla</Emphasis>
(1) Key Laboratory of Forest Tree Genetic Improvement and Biotechnology (Ministry of Education), Northeast Forestry University, 26 Hexing Road, Harbin, 150040, People’s Republic of China;